Grinding machine



y 1945- v c. R. WILLIAMS 2,375,504

GRINDING MACHINE Filed Jah. 2, 1942 2 Sheets-Shet 1 Patented May 8, 1945 1 UNITED PATENT OFFICE a a fyzsiasoe p v a GRINDING MACHINE.Clarence .R. Williams Brooklyn; NJ Y., assignor t'toAtlanticServiceCompainy, Inc., Brooklyn, N. Y.,ta. corporation of NewYork ApplicationJanuary 2, 1942; Serial No. 425,428 ,ll C laimsl ('01.51-135) This invention relates to grinding machines of" th'eabrasivebelt type for sharpening knives and similar articles and is animprovement upon the grinding machine shown in U. 3. Patent 2,222,966

issued in my; name on November 26; 1940. J

An object r the present invention isto provide an improved tool holdingmechanism for this type of niachinewhich is" readily adapted to avariety of tools. Other objects of the invention will be apparent fromthe following specification and the accompanying drawings, in which:

Fig. 1 isa side elevation of the housing of the grinding mechanism withthe cover removed; Fig. 2 is aside elevation of the mechanism takenon'theoppositeside from Fig. 1;

Fig. 3" isja top planviewof the mechanism;

Fig. 4 is a sideelevation ofthe tool holding mechanism by itself,without the housing:

aligned spring tables I! and l8which aresecured to, the inner 'frame l9,that in turn is fixed to Fig. 5isa side elevation of the .tool" holdingmechanism on the opposite side from, Fig. 4,

except adjusted for a heavier tool and f Fig. 6 isan end view from theleft of Fig. 5. i This machine comprises a housing enclosing apairiofb'elt wheels upon which an'abrasive belt a'motor exteriorof thehousing, (not shown in is mounted and one of these wheels is driven by'thiscase) to move the belt underthe tool that is" being sharpened. Aportion of the top .of the housing isremovable to expose a portionof thebelt, butis lockedin its operating position, and an adjustable toolholder'ispivotally mounted on andguideplate 53, the free edge of whichterminates in the turned up flange 54.

the housingto hold the tool ina predetermined position relative to" thebelt while ground or sharpened.

, The toolholding mechahismcomprises apair of plates, theupper edgesiofwhich are adjustit is being able relative to the plane of the belt'tojdetermine the-angularposition of the tool relativeto the belt andals'oto a pivoted guard and guide memberi'which partially covers the belt andwhich is latched in its operative j position. A; bail is pivotallysecured to the guide member withi'ts free endsupported' by 'said toolholding plates and is arranged to provide a single pointof support'forthe' side of the tool, thesharpen'ed edge of; which is supportedon sai'djbelt. Theguard member" and the bail may be turned back clear ofthe abrasive beltwhen the whole surface of thebelt is tobe used forothergrinding purposes.

the drawings, l l isthe mechanism housing in which is the drivingpulleyilz, mounted on the shaft I 3, and a following pulleyfll l mountedthehousing H. The. shaft, I3 is drivenby a suitable motor arrangedtomaintain the belt taut as shown in theabove mentioned patent.

Ap'air of adjustable supporting plates 2| and 22,.pivoted at 23 to theframe 19' and tied to. gether by a rod 24, are located one on each sideof the pulley H; and within the housing. Anarcuate arm25 is connected toplate 22 and extends outside the housing where it is. providedheightofwhich is adjustable, the guard being held by the wing nut 3|. i

A sleeve 5|, developed from the top of the housing H; supports the pivot52 of the inclined guard plate overliesthe belt and is provided withdependent sidewings 55 which passbetween the opposite sides ofthe beltand the housing. One

of these side wings is provided with a horizontal slot 56 to receive thelocking lever 51 that is pivotedat 58 to the frame I9: When thetguideplate 53 is brought into the operating or grinding position as indicatedin Figs. 2 and 5; the lever" 5T'is moved forwardly into the slot 56 and.rigidly secures theplate 53 withthe loweredge of flange .54 spacedfromthe belt Hi. It is against this the housing. Between the pulleys l2 andt lower edge that the side of the tool or knife engages during rinding;t t

A bail Bllxis provided with the turned-in ends 6|= and 62 whicheht'erapertures in the wings of the guide plate 53, forming a pivotedconnection therewith. The bail is somewhat wider than the frame so thatits crossbar can engage the upper edges of the supporting plates 2| and22- inone position of the bail. The crossbar or the bail is preferablybent upwards at. the center, as

indicated at 63, Fig. 6, so that when the'bail is provides a singlepoint support for the side of the tool, which point is locatedcentrallyof the abrasivebelt. Usually,the bail is used only for theheavier tools, suchas butchers cleavers, and

The guard the point 63 thereof, as explained above.

otherwise it is swung back upon the guide plate 53, as seen in Figs. 1to 4.

In operation the supporting plates 2| and 22 may be adjusted to whateverheight is best for the particular knife or tool, such as indicated inFig. 4 for the tool b. This adjustment varies from the position wherethe upper edges of the supporting plates are substantially in the sameplane as the top of the belt l6,'as seen in Fig. 2,

' to a somewhat pronounced angle to the plane of the belt, limited onlyby the length of the slot 26 in the arm 25. The side of the knife ortool with a pair of belt wheels, one of which is driven to move thebelt, an abrasive belt mounted on said wheels, a tool guide comprising aplate pivoted to said housing and overlying said belt and having turneddown sides with a slot in one of said sides, a lever pivoted to saidhousing engaging said slot to position, and lock said plate in theoperative position and the forward end of said plate being bent upwardsto reinforce the edge of said plate where it engages the tool to holdtheedge of the tool in engagement with the belt.

rests on the upper edges of these supporting plates 2| and 22 as it isbeing sharpened, unless the bail 60 has been lowered as shown in Fig. 5,in which case the cleaver or other tool rests on It will be understood,of course, that the supporting plates are similarly adjustable when thebail is in the position shown in Fig. 5.

When the guide member 53 is latched in posi tionas indicated in dottedoutline in Fig. 4 and in full lines in Fig. 5, the flange 5d forms anabutment for the upper side or face of the tool, while the lower side orface is supported by the adjustable plates 21 and 23 and the belt. Inthis position the edge of the knife projects under the flange 54 intospace which is unobstructed except for the belt 16 that passestherethrough, so that 'the'cutting edge of the tool may be sharpened toinfinity for both thin and thick tools. The

, tool'may be drawn back and forth across the belt as indicated at a,Fig. 3, the tool being guided by the lower edge of flange 54, and if thetool is a common table knifewith a polished surface the plates 2| and 22may be so adjusted as to 4. A grinding machine comprising a housing witha pair of belt wheels, one of which is driven v to move the belt, anabrasive belt mounted on said wheels, a tool rest comprising a bailpivoted to I 1 said housing, said bail when in the operative poprotectthe polished surface from the abrasive belt while the edge is beingground. v

The wedge shaped tool d,'Figs'. 5 and 6, may be in the form of acleavera'nd a three-point support may be preferable for a tool of thistype, comprising'a single support on the center line of the belt and thebroader support by the belt I 6. When thebelt is to be replaced on thepulleys the guard member 53 is turn'edback and the side" plates 2| and22 are lowered,'-'making the belt readily accessible from the side ofthe mechanism which is opened by removal of the cover 64.

Having thus described my invention, I claim: 1. A grinding machinecomprising a housing with a pair of belt wheels, one of which is drivento move the belt, an abrasive belt mounted on said wheels, a combinedguard and tool guide for said beltcomprising a plate pivoted to saidhousing and overlying said belt, means for latching said guard in theoperative position, means on said guard engaging'the tool to hold theedge of the tool in engagement with the belt when the guard is inlatched position; and separate adjustable means for supporting the toolin operative position.

2.-A grindingmachine comprising a housing with a pair of belt wheels,one of which is driven to move the belt, an abrasive belt mounted ong toengage the tool and form a support sition having a single raised portionover the belt about which the tool may pivot.

5. A grinding machine comprising a housing with a pair of belt wheels,one of which is driven to move the belt, an abrasive belt mounted on.said wheels, a tool rest comprisinga bail pivoted to. said housing,adjustable means engaging the free end of the bail to vary its anglerelative to the plane of the belt, said bail when in the operativeposition having a single raised portion.

over .the belt to engage the tool and form a support about which thetool may pivot. 6. A'grinding machinev comprising a. housing with a,pair of belt wheels, one of which is driven to move the belt, anabrasive belt mountedon said wheels, a tool, rest and guard for saidbelt.

comprising. a plate pivoted to the. housing and extending over saidbelt, a bail pivoted to said plate, means for locking said plate inthe-operative position, means for adjustably supporting the free end ofsaid bail, and means cooperatingwith said ball providing a three pointsupportfor the tool in the grinding position.

"7. A grinding machine comprising a, housing with a pair of belt wheels,one of which is driven to move the belt, an abrasivebelt mounted onsaidwheels, a tool rest and guard forsaid beltcomprising a plate pivoted tothe housing and extending over said belt, abail pivoted to said plate,means for locking said plate in the operative position, said platehaving its edge extending at right angles to the line of movement ofthe-belt, and said bail in the operative position having a single raisedportion above the center of thebelt to engage the under side of the topof the tool while the edge of the plate engages the tool to hold it inthe grinding position,

8. A grinding machine comprising a housing, with a pair of belt wheels,one of which is driven to move the belt, an abrasive belt mounted onvsaid, wheels, a tool rest and guard for said belt comprising a platepivoted to the housing and extending over said belt, a bail pivoted to-said plate, means for locking said plate in the operative position, apair of adjustable plates also pivoted to said housing with their edgesadjustwe able relative to the plane of the belt, means for adjusting theposition of said last mentioned plates, the free end of said bailresting upon said plates and providing with the'edge of thefirstmentioned-plate a support and guide for the tool in the grindingposition.

9. A grinding machine comprising a housing with a pair of belt wheels,one of which is driven to move the belt, an abrasive belt mounted onsaid wheels, a rest for the tool in the grinding position, comprising apair of plates pivoted to said housing with their edges adjustablerelative to the plane of the belt, means for adjusting the 11. In agrinding machine, a housing, a pair of i belt wheels mounted therein,one of which is position of said plates, and a member adjustablysupported by said plates and engaging the tool above the center line ofthe belt to support the tool in the grinding position. p 10. In agrinding machine, a housing, a, pair of belt wheels mounted therein, oneof which is driven to move a belt, an endless abrasivebelt rotated bysaid wheels, a tool guide extending across the belt and fixed in spacedrelation thereto, and a tool support adjustable relative to the plane ofthe belt without adjusting the guide, the

support cooperating with said guide in its several adjusted positions sothat the tool can enter said space and engage the belt according to thedesired angle of the particular cutting edge.

driven to move a belt, an endless abrasive belt rotated by said wheels,a tool guide extending across the belt and fixed in spaced relationthereposition to provide a single point support on the i side of themales it is being sharpened, while the end of the tool is supported onthe belt and guid-V ed by the tool guide. 7

' CLARENCE R. WILLIAMS.

